[refactor] refactor code for article 1, to make it work. remove station data folder. deactivate normalize()

[refactor] refactor one fold fit, enable to get sorted estimators with other selection criterion without more computation

[refactor] add cached property on nllh, rename function from fit to margin function from fit. rename nb params to nb params from margin function

[refactor] rename function from fit to margin function from fit. remove sorted_estimators_with_stationary

[projection snowfall] refactoring & move folders. adapt the relative change formula for negative values.activate the goodness of fit test. handle an additional type of climate coordinates. and plot of the value & of the GEV parameters.

[projection snowfall] add plot_gcm_rcm_effects.py, and improve plot_relative_change_in_return_level.py

[projection snowfall] fix one special case for the formula. fix issue in model check in one fold fit. fix the parameter for one model. big bug fix in evgam.

[projection snowfall] refactor the formula for the effects. add param_name_to_ordered_climate_effects for the spline_margin_function.py and for the polynomial_margin_function.py. add some assertion

[projection snowfall] add test_ensemble_fit_single_altitude.py and remove one test from multiple altitudes. add climate_effects for the fit in evgam

[projection snowfall] add climate_coordinates_with_effects attributes everywhere. refactor __init__ method for many temporal model.

[projection snowfall] add observation to the together fit. assign the average global temperature of all gcms for rcp 8.5 as covariate for the observations. add assertion

[projection snowfall] fix error in one fold fit for the temperature covariate & for the significance.
modify number of parameters for the spline, and only counts the number of coefficients and not the number of knots.

[projection snowfall] modify altitude_class to altitude_group in visualizer_for_projection_ensemble.py. fix index for ensemble dataset.  add plot_relative_change_in_return_level.py

[projection snowfall] add functions_utils.py. modify one_fold_fit.py so that it may support one altitude fit.

[projection snowfall] refactor nb_params. so that is it associated to the margin_function rather than to the margin_model.

[projection snowfall] adapt the one_fold_fit.py code to handle fit with a single altitude. Modify altitude_class by altitude_group, adapt tests. Modify the DefaultAltitudeGroup. adapt main_projections_ensemble.py

[projection snowfall] add spline simulation. implement splines for k=1. pass test_gev_temporal_spline.py

[projection snowfall] fix one issue for evgam coefficients. refactor param_name_to_dim -> param_name_to_dims in the result objects.

[projection snowfall] add spline_margin_function.py and test with it. test_gev_temporal_spline.py is not yet validated for the nllh.